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Lower Gibble Gulch Surtace Water Quality and Field Parameters w Mountain Coal West Elk Mine Monitoring Location Descri tion Field Parameters L. Gribhle Gulch Units Baseline Minimum Maximum Mean 2005 Water Year 5/4/2005 6/6/2005 9/13/2005 Flow m 35 6.fi o Electrical Conductivit umhos/cm 825 992 H SU 7.99 8.12 Tem erature °C °C Tem erature °F °F 5a.9 59.3 Comment Laboroto Parameters' Name of Certified Lab ACZ Lab Reference # L51525-08 Sam 10 Date 6/6/2005 Lab Test Date s18-6122 Sam led B Alkalinit Total CaCO3 m /I Aluminum, dissolved m /I Anions me /I Arsenic, dissolved m /I Arsenic, total m /I BlcarbOnate m /I 304 477 353 Boron, dissolved m /! Cadmium, dissolved m /l Calcium, dissolved m /I Carbonate m /I Cation -Anion Balance Cations me /l Chloride m /I 3 5 4 Contluctivit umh05/cm 1250 1250 1250 789 Co er, dissolved m /I Hardness m h 308 460 371 H droxide m /I Iron, dissolved m /I 0.07 Iron, total m /I 0.89 0.44 1.21 Leatl, dissolved m /I Lead, total m /I Ma nesium, dissolved m /I 32 39.7 35.9 Man anese, dissolved m /I Man anese, total m /I O.o15 o.ooe Mercu ,total m /I Mol bdenum, dissolved m /I Nitrate as N m /I Nitrate/Nitrite as N m /I 0.05 0.35 0.15 Nitrite as N ,dissolved m /I H lab SU 7.2 7.2 7.2 8.4 Phos hate m /I Phos horns Ortho ,dissolved m ll 0.006 0.002 Potassium, dissolved m !I Selenium, dissolved m /I Selenium, total m /I Sodium Absor tion Ratio SAR talc. 0.86 2.5 1.5 Sodium, dissolved m /I 80 260 135 Sulfate m /I ao0 7a0 5s0 TDS Ratio talc. TDS Calc. m /I TDS m /I 24 60 42 500 TSS m /I 58 Zinc, dissolved mg/I 'Baseline, WY 2000, and WY 2001 data ada ted from WWE. ACZ -ACZ Laboratories, Inc. Steamboat S rin s, CO Ne alive values denote readin s below lab detection levels NM -Not Measured West Elk Mine C-12 2005 Annual Hydrology Report HydroGeo, Inc.